External wall of steam-boiler chambers or of flues



(No Model.) 2 Sheets-Sheet 1.

G. H. SELLERS. EXTERNAL WALL 0F STEAM BOILER CHAMBERS OR 91-" FLUES' I No. 430,811. Patented June 24, 1890.

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I 2 Sheets-Sheet. 2.

G. H. SELLERS. EXTERNAL WALL 0E STEAM BOILER CHAMBERS 0B OF PLUES. No. 430,811.

Patented June 24 189 0.

FIG. 3.

HUI/ENTOR V W/ T/VESSES UNITED STATES,

PATENT OFFICE.

GEORGE I-I. SELLERS, OF RIDLEY PARK, ASSIGNOR TO THE EDGE MOOR IRON COMPANY, OF EDGE MOOR, PENNSYLVANIA.

EXTERNAL WALL OF STEAM-BOILER CHAMBERS OROF FLUES.

SPECIFICATION forming part of Letters Patent No. 430,811, dated June 24, 1890.

' Application filed December 20,1889. Serial No. 334,434. (No model.)

To all whom it may concern:

Be it known that I, GEORGE H. SELLERS, of Ridley Park, Delaware county, in the State of Pennsylvania, have invented certain new and useful Improvements in the External Walls of Steam-Boiler Chambers or of Flues, of which improvements the following is a specification.

In steam-boilers which are set in brick-work the brick masonry which surrounds or incloses the boiler forms a chamber or chambers which receive the products of combustion as they pass from the firing-chamber, and, while holding these products in contact with the boiler to which they give off their heat, conduct them to the chimney, through which they pass into the atmosphere. The draft of the chimney is usually the force which induces the passage of the products of combustion through or about the steam-boiler, and consequently the pressure within the boiler chamber or chambers above described is less than that of the surrounding air, and this air will therefore enter such chamber wherever it is possible to do so. \Vhen the air to support combustion in the firing-chamber is supplied by blast-that is to say, under pressure-it is quite possible that the pressure in the chamber or chambers above referred to may exceed that of the surrounding air, and this condition may always be assured by a proper manipulation of the damper, in which case there is no tendency for the surrounding air to enter the boiler-chambers; but wherever the surrounding air can enter the boilerchamber its tendency must be to cool off this chamber, and thereby detract from the efiiciency of the boiler. In all cases where the boiler-chamber surrounds the whole boiler, the surface exposed to the air being very large, thetransmission of air through the brick covering is seriously detrimental when the boiler-furnace receives its supply of air by natural draft, and my present invention is more particularly advantageous in such cases. It is well known that a brick wall of such thickness as is usually employed in the setting of steam-boilers is quite pervious to air, not alone through the cracks which are almost certain to occur from the expansion and contraction of the wall, but that such walls when in perfect condition will permit the transmission of a large quantity of air.

It is the object, therefore, of my present invention to provide a simple and inexpensive addition to the boiler-wall which will effectually prevent the passage of any air through it; and to this end my invention consists in providing a thin sheet-metal lining for the boiler-chamber, which lining is maintained in its position and protected from injury by brick masonry on each side of it, and that my invention may be more fully described reference will now be had to the drawings, in Which- Figure 1 represents a side elevation of a cylindrical boiler internally fired, with the walls of the boiler-chamber in section, and Fig. 2 a cross-sectional elevation of the same on the line D E, Fig. 1. Fig. 8 is a vertical section of the boiler-coverin g to a larger scale, showing the mode of constructing the openings at the points where the attachments of the boiler pass through this cover. Fig. 4 is a cross-section of the same, and Fig. 5 is a plan of the cast-iron collar which is shown in section in Figs. 3 and 4.

The boiler-chamber is formed by a nineinch brick wall A A A, which entirely surrounds the boiler B B, except at the firing end, the distance of this wall from the boiler varying in different parts, as shown. This wall is covered by thin stove-pipe iron or roofing iron or tin laid on in sheets, which are united together by any of the methods usu- 8 5 ally employed in roofing, and this covering or lining a a a a is itself covered by another layer of brick masonry (J O C, which eifectually protects the thin metal lining from injury and maintains it in position, while the metal covo erin g eifectually prevents the transmission of air through the masonry; At the points on top of the boiler where the safety and steam valves are located and where the man-hole is attached provision must be made for pre- 5 venting the admission of air. This is accomplished by inserting in the brick masonry at these points cast-iron flanged collars which are large enough to go over the flanges on the boiler to which the valves are attached, and

a larger size around the man-hole, which collars are supported on the metal lining which covers the inner division of the brick masonry. (See Figs. 3 and 4.) The ends of these collars next the boiler are shaped to fit the same and are set so as to clear it when eX- panded by heat. The interior between the nozzles which support the valves is then packed with asbestus fiber or mineral wool or some other elastic and refractory material, and its outer surface is covered with sand. The space d above the boiler, Fig. 1, between the boiler and the brick-masonry covering, is also packed with materialv similar to that above described around the nozzles.

In'many cases it is important to maintain the temperature of the outgoing gases from a boiler-chamber until they can be passed through an economizer, in which their heat can be made available, and as the air which 20 passes through the walls of the brick fiues heretofore constructed leading to the economizer causes, perhaps, the greatest loss of heat in such cases, this loss will be entirely relieved by the introduction of the metal covering I have described.

Having thus fully shown and described my improvement, what I claim as new, and desire to secure by Letters Patent. is

The external walls of a boiler-chamber or.of 30 

